CAJ | 학술논문

考察了不同目数下碳酸氢钠的热分解温度;采用熔融法和溶液法,使用硬脂酸、芥酸酰胺等5种改性剂对碳酸氢钠进行改性,利用DSC和TG评价其改性效果。结果表明：碳酸氢钠的目数对其热分解温度有一定影响;采用有机包覆改性碳酸氢钠的方法能够有效提高其分解温度,缩短分解区间,提高分解速率,从而应用于泡沫塑料加工;当NaHCO3∶硬脂酸的质量比为1∶0.5时,采用熔融法所得的改性碳酸氢钠的起始分解温度由115℃提高至178℃,分解区间由61℃缩短至25℃;改性前后碳酸氢钠的热分解反应都符合＂成核与核增长＂机理中的Avrami-Erofeev方程,改性剂的添加会导致核成长因子n的增加,改性碳酸氢钠的活化能Ea也有所提高。
고찰료불동목수하탄산경납적열분해온도;채용용융법화용액법,사용경지산、개산선알등5충개성제대탄산경납진행개성,이용DSC화TG평개기개성효과。결과표명：탄산경납적목수대기열분해온도유일정영향;채용유궤포복개성탄산경납적방법능구유효제고기분해온도,축단분해구간,제고분해속솔,종이응용우포말소료가공;당NaHCO3∶경지산적질량비위1∶0.5시,채용용융법소득적개성탄산경납적기시분해온도유115℃제고지178℃,분해구간유61℃축단지25℃;개성전후탄산경납적열분해반응도부합＂성핵여핵증장＂궤리중적Avrami-Erofeev방정,개성제적첨가회도치핵성장인자n적증가,개성탄산경납적활화능Ea야유소제고。
The decomposition temperature of sodium bicarbonate with different mesh number was studied.Five modifiers,including stearic acid and erucamide,were used to modify sodium bicarbonate by melting method and solution method.The effects of modification were evaluated by differential scanning calorimetry(DSC) and thermal gravimetric analysis(TGA).The results showed that the mesh number of sodium bicarbonate has influence on its decomposition temperature.The organic coating and modification of sodium bicarbonate can increase the initial decomposition temperature,narrow the range of decomposition temperature and improve the decomposition rate.All of these can be used in the processing of foam plastic.Sodium bicarbonate was modified by melting-method with a mass ratio of 1∶0.5 obtained in the optimized condition,in which its initial decomposition temperature is increased from 115 ℃ to 178 ℃,and its decomposition temperature range is narrowed from 61 ℃ to 25 ℃.The most probable mechanism functions of the thermal decomposition of sodium bicarbonate and modified sodium bicarbonate agree with Avrami-Erofeev equations.The addition of modifiers can increase the nucleation growth factor n and apparent activation energy Ea.